Lightweight FN-FAL project

Photos of prototype match rear sight and match barrel are now available. Rear sight is almost ready for production!!


Muzzle brake photos have been moved here. Now includes video.

The goal of this project was to build a lightweight FAL utilizing an aluminum upper and lower receiver. The lower is a Belgian obtained from a friend at a gun show for $100. The upper is a Williams Arms Combat Elite upper receiver. This is the best manufactured FN receiver I have ever seen, made of 7075-T6 aluminum alloy with perfect tolerences. The parts kit was an STG-58, and all parts dropped right in. I used a new Begian 18" barrel. The barrel screwed into the receiver with a class one fit and aligned top dead center without requiring massive torque like the originals. For more info, Email me a

Williams Arms Aluminum FAL receiver, left side

Williams Arms Aluminum FAL receiver, right side
The completed gun is shown below. The finished rifle weighs in at 7.25 lbs. Recoil was what one would expect for a 7 lb .308 rifle. I designed and built an muzzle brake that reduces felt recoil to about AR-15 levels. Balance with the 18" bbl is right at the receiver. I added a B-Square FN scope mount and Trijicon ACOG Reflex sight to complete the package. Next the gun gets a trigger job. Details to follow.
Details of the Trijicon ACOG Reflex sight

Straight forward and simple. No batteries for this amber dot sight. This is the weaver base version.

Front view showing the optional Tenebraex KillFlash filter. This filter acts as a sunshade and all but eliminates reflection from the lens.

Some detail of the trigger job. A 4-40 set screw through the trigger to control overtravel. Not show is the modified sear and sear notch, trigger takeup screw and modified safety. The trigger modifications also included modified trigger return and hammer springs. Trigger is now about 4-5 lbs (need to check it) with little takeup, crisp let-off and no overtravel. Note the 2 position safety.

A Tale of two FNs

I compared the FAL with aluminum upper and lower receivers to the FNC .223 rifle. Interestingly, they both weigh 8 lbs according to my scale. Note that the 8 lbs for the FAL includes the Trijicon ACOG Reflex sight. .308 vs. .223. Hmmm...